Scotsman MAR 106, Service Manual

Page: 23 / 42

The rotating parts are:
a) the clip retainer ring
b) the spring collar
c) the compression spring
d) the stainless steel seal ring with O ring.
The stationary parts are:
a) the graphitic ring with O ring
b) the stainless steel housing ring with gasket
and O rings.
O. Heat Exchanger
A heat exchanger is mounted in the suction
and liquid line to reduce flash gas in the liquid
line, to reduce liquid refrigerant in the suction
line and to subcool the liquid refrigerant
thereby increasing the operating efficiency.
P. Sight Glass
A sight glass is installed in the liquid line. The
sight glass will show bubbles if the system is
low on refrigerant.
Q. Filter Drier
All MAR units mount a "Solid-core antiacid
filter drier" on liquid line. This drier may be
installed in any position provided that the
arrow on its body point in the direction of
refrigerant flow.
R. Contactor
MAR contactors have 3 or 5 contacts normally
open and 1 contact normally closed. The N.C.
contact is generally used to keep the
crankcase heater energized during the OFF
periods. The contactor coil is generally at
230 V 50 Hz 1 Ph and kept energized by the
system controls that are connected in series.
S. Thermostat (Ice level control)
When storage room temperature is higher to
that of the ice being made, the ice level can be
positively controlled by this thermostat, the
sensing bulb of which must be positioned to
the wanted level that will, abviously correspond
to the desired ice level in storage room.
The temperature range dial must be set on to
the proper temperature in order that the control
may cut-out or may cut-in respectively when
its sensing bulb gets buried into the ice cone
and when is freed from the ice.
This thermostat can be a valid control if it is
used in non-refrigerated storage rooms as in
these cases it is influenced just by the ice
temperature.
T. Ice Spout Safety Switch
Located on top of the Ice Spout, the Safety
Switch is operated by a plate on top of the ice
chute by the ice backing up in the spout.
The switch will shut-off the entire ice making
mechanism.
U. Ice Level Control
Must have its sensing capillary extended into
ice room in a way that it could be contacted by
the ice when storage ice room becomes filled.
It terminates ice production when its capillary
gets in contact with ice. It is wired in series
with all other controls. It is factory set to cut-
out at 1,5
°
C and cut-in at 4
°
C.
V. ON/OFF switch
The manual start-up or switching of the entire
system requires the attention of the operator
who may instantly keep control of the situation,
supplied.
W. Compressor Delay timer
Delays the start up of the compressor by 18'
at every start up of the ice maker. Supplied.
X. Drum rotation delay timer
Delays drum STOP by 18' at every trip OFF of
the ice maker. Supplied.
Y. 3 - phases monitoring relay
On the power IN, it checks and assures correct
rotation of the drive motor - evaporator drum.
Supplied.
Z. Drum rotation control
It operates using the Hall effect sensor /
principle. In case the drum is not rotating at all
(or it rotates too slow - less then 1/4 turn every
30") such relay trips the unit OFF so to avoid
that in case of fiber keys breakage, the drive
motor - gear reducer and compressor can
operate with the drum OFF. Supplied.
Page 23